Finland fought with Soviet Union in 30 November 1939 - 13 Mar 1940, called Winter War. The population of Finland was 3.70 million, otherwise Soviet was 170 million. Ski troops of Finland attacked supply line of Soviet army. The skiing poles were made of bamboo which were imported from Japan. I remember skiing in Hokkaido of Japan, when I was a boy. Finland Navy had built artillery base for 2 120 mm Armstrong guns in 1920. One of them was made at IJN Kure Arsenal in 1897. The Finland Navy Coast Artillery Museum exhibits it at the gate. You can read "弐千百四拾参基　呉海軍造兵廠　明治参拾壱年" on the breech in kanji. The 5th division of Finland army had 12 150mm howitzers made in Japan. Russia bought them before WWI, and Finland captured in 1918. Finland army used IJA type 38 rifle. A gun shop sells them for 10,000 yen in Helsinki. Ammno were 6.5mm made in Sweden, and are made even now.

In the end of the war, Finland lost 62 aircraft, 72 artillery guns, 79 anti tank guns, 29 motars, 480 light machine guns, 467 heavy machine guns, 5,568 rifles. 21,396 soldiers KIA, 1,434 unknown, 43,557 wounded and 1,029 citizens KIA.
Umemoto p40-42, p.62, p.123, p.266-267

The table shows ammo dissipation of Finland. Ammo dissipation of heavy guns and small weapon was very high. Russians might worry about attacks of small troops with artillery and fort artillery guns. I do not know why Finns dissipated mortar ammo much. In case of combats of IJA and USA, USA was afraid of IJA mortars.

Ammo Dissipation of Finland till the end of December

Kind	Rifle [million]	Machine gun [million]	Anti Tank	Mortar	76mm	107mm	122mm	150mm	155mm
At war	156.2	21.9	32,000	100,842	205,808	5,139	43,487	6,000	16,944
End of Dec	25.0	3.0	10,543	68,504	107,884	1,508	11,281	1,780
Residual ratio	16%	14%	33%	68%	52%	29%	26%	8%